JP7186441B2 - drum dryer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a drum dryer used when heating and drying a liquid raw material to produce a dried product.

As a drum dryer for producing a dried product, as shown in Patent Document 1 below, a heated drum is rotated to supply a liquid raw material to the surface of the drum to dry and solidify, and the dried and solidified dried product is scraped. It is common to scrape and collect by scraping. Examples of dry products include chemical products, chemicals, foodstuffs, dyes and the like.

In such a drum dryer, a transfer conveyor such as a screw conveyor is attached below the scraper, and the dried product scraped by the scraper falls under its own weight and is collected in the screw conveyor. The collected dry products are conveyed to a predetermined product collection section by a screw conveyor.

Japanese Patent Application Laid-Open No. 2001-231515

However, in the above-mentioned conventional drum dryer, the dried product scraped off by the scraper becomes a light powder (fine powder). Instead, some dry product floats and scatters inside the housing. If the dried product scattered in this way adheres to and remains inside the device (drum dryer), it becomes a factor for the generation of germs, etc., so cleaning work and maintenance work require a lot of labor, making cleaning work difficult. There was a problem that

In addition, a normal drum dryer is provided with an exhaust duct in the housing, and the exhaust duct is used to exhaust the vapor generated from the liquid raw material during manufacturing. is sometimes discharged from the exhaust duct together with the steam, and in that case, there is also a problem that the recovery efficiency of the dried product is lowered. Furthermore, when the scattered dried product is exposed to steam in the housing, the dried product absorbs moisture again, resulting in a decrease in dryness, and there is a possibility that the quality of the dried product may be deteriorated.

The present invention has been made in view of the above problems, and is capable of preventing the scattering of dried products, facilitating cleaning and maintenance work, and efficiently collecting high-quality dried products. To provide a drum dryer capable of

In order to solve the above problems, the present invention has the following means.

[1] Equipped with a drum that rotates in a heated state and a scraper with a cutting edge facing the outer peripheral surface of the drum, the liquid raw material supplied to the outer peripheral surface of the drum is heated and dried, and the drying is performed. A drum dryer in which the product is scraped by the blade edge of the scraper,
a suction nozzle provided with a suction port at one end and an outflow port at the other end, and arranged in such a manner that the suction port faces the cutting edge of the scraper;
a discharge pipe to which the outflow port of the suction nozzle is connected;
By setting the inside of the carry-out pipe and the suction nozzle to a negative pressure, the dried product scraped by the scraper is sucked into the suction nozzle through the suction port, and the predetermined product is supplied through the carry-out pipe. A drum dryer comprising suction means for suction and recovery in a recovery section.

[2] The drum dryer according to the above item 1, wherein the suction nozzle is formed such that the cross-sectional area of the internal flow path gradually decreases from one end to the other end.

[3] The suction nozzle has an openable/closable lid corresponding to the suction port,
3. The drum dryer according to the preceding item 1 or 2, wherein the cutting edge of the scraper is exposed to the outside when the opening/closing cover is opened.

[4] The suction nozzles are arranged in parallel along the axial direction of the drum,
The carry-out pipe is arranged such that the length direction as the carrying direction is along the direction in which the plurality of suction nozzles are arranged side by side, and the outlets of the plurality of suction nozzles are spaced apart in the length direction of the carry-out pipe. are sequentially concatenated in
4. The drum dryer according to any one of the preceding items 1 to 3, wherein the carry-out pipe is formed such that the pipe diameter increases stepwise or continuously from the upstream side to the downstream side in the carry-out direction.

According to the drum dryer of the invention [1], the dried product scraped by the scraper is sucked and collected by the suction nozzle, so that the dried product can be collected without scattering. As a result, it is possible to prevent the dried product from remaining adhered to the inside of the device (drum dryer), prevent the generation of germs, etc., and facilitate cleaning and maintenance work. Furthermore, there is no product loss due to the scattering of the dried product, the dried product can be efficiently collected, and the dryness can be prevented from being lowered due to the moisture absorption of the dried product during scattering, so that the dried product of high quality can be reliably manufactured.

According to the drum dryer of invention [2], since the cross-sectional area of the flow path from the suction side to the outflow side of the suction nozzle is formed to gradually decrease, the suction force and suction speed of the suction nozzle gradually increase, The dried product sucked into the suction nozzle does not stagnate on the way, and the dried product can be recovered more efficiently and smoothly.

According to the drum dryer of the invention [3], the cutting edge of the scraper can be exposed by opening the open/close lid of the suction nozzle, so cleaning work and maintenance work of the scraper and its surroundings can be performed without hindrance.

According to the drum dryer of the invention [4], since the carry-out pipe to which the plurality of suction nozzles are sequentially connected is formed so that the pipe diameter increases in the conveying direction, the suction means uniformly distributes the suction nozzles. A suction force can be applied, the dried product can be sucked evenly in the series of suction nozzles, and the dried product can be recovered more efficiently.

FIG. 1 is a side cross-sectional view showing a drum dryer that is an embodiment of the present invention. FIG. 2 is a front view showing the drum dryer of the embodiment with its housing removed. FIG. 3 is an enlarged side view showing the vicinity of the suction nozzle in the drum dryer of the embodiment. FIG. 4 is a side view showing the suction nozzle of the embodiment. FIG. 5 is a side view showing an exploded suction nozzle of the embodiment. FIG. 6 is a back view showing the suction nozzle of the embodiment. FIG. 7 is a front view showing a carry-out pipe in the drum dryer of the embodiment.

FIG. 1 is a side cross-sectional view showing a drum dryer according to an embodiment of the present invention, and FIG. 2 is a front view showing the main body of the drum dryer, that is, a state in which a housing 1 is removed.

As shown in both figures, the drum dryer of this embodiment is a double drum type having a pair (two) of drums 2, 2, and the pair of drums 2, 2 are arranged in a housing (chamber) 1. . The pair of drums 2, 2 are rotatably mounted around the axis by supporting both ends of each rotating shaft portion on a supporting frame 11, respectively. A pair of drums 2, 2 are arranged in parallel so that their axes are parallel to each other in the horizontal plane. Further, the pair of drums 2, 2 are arranged so that their outer peripheral surfaces are substantially close to each other with a small gap therebetween.

In the drum dryer of this embodiment, the structure of the other drum 2 (the right half of FIG. 1) is symmetrical with respect to the structure of one drum 2 (the left half of FIG. 1), and is substantially the same. Therefore, in the present embodiment, basically, only one drum 2 side will be described, and redundant description will be omitted.

Each drum 2 is configured to be rotationally driven at a constant speed in the direction indicated by the arrow in FIG. 1 by rotational driving means (not shown). Further, the drum dryer of the present embodiment is provided with heating steam introduction means (not shown), and the heating steam is introduced into each drum 2 from the heating steam introduction means so that the outer peripheral surface of the drum 2 reaches a predetermined heating temperature. is configured to hold

A raw material supply section 21 is provided above between the pair of drums 2 , 2 , and the liquid raw material M is supplied between the drums 2 , 2 from the raw material supply section 21 . The liquid raw material M supplied between the drums 2 adheres to the outer peripheral surface of each drum 2 and moves along the outer peripheral surface of the drum as each drum 2 rotates.

An exhaust duct 15 is installed on the upper wall of the housing 1, and the exhaust duct 15 is configured to suck and discharge the vapor generated from the liquid raw material M during the manufacture of the dried product to the outside of the housing 1. ing.

A scraper support mechanism 4 is arranged above the drum 2 in the housing 1 . The scraper support mechanism 4 includes a rotating shaft member 41 and a cylinder 44 arranged in the vicinity thereof. Both ends of the rotary shaft member 41 are rotatably attached to the support frame 11 via the support base 12 . The rotating shaft member 41 is configured to be rotatable about its axis while its axis is arranged parallel to the axis of the drum 2 .

The body of the cylinder 44 is rotatably attached to the support base 12 , and the tip of the rod is rotatably attached to a bracket 42 provided on the rotating shaft member 41 . As a result, the rod portion of the cylinder 44 advances/retreats, so that the rotating shaft member 41 rotates in the forward/reverse direction by a predetermined amount.

A scraper support plate 43 is attached to the rotating shaft member 41 so as to protrude downward. A base end portion (upper end portion) of the scraper 3 is fixed to the scraper support plate 43 so as to protrude downward. As a result, the rotary shaft member 41 rotates forward/reverse by driving the cylinder 44 , so that the cutting edge 30 of the scraper 3 contacts and separates from the outer peripheral surface of the drum 2 . When the edge 30 of the scraper 3 is close to the outer peripheral surface of the drum, the edge 30 of the scraper 3 can scrape off the dried product adhering to the outer peripheral surface of the rotating drum 2 . Further, when the cutting edge 30 of the scraper 3 is separated from the outer peripheral surface of the drum, the scraper 3 can be cleaned, maintained, and replaced without any trouble.

On the other hand, in the drum dryer of this embodiment, a product recovery device 5 unique to this embodiment is installed. The product recovery device 5 includes a plurality of suction nozzles 6 for sucking the scraped dry products, and a discharge pipe 7 for sucking and collecting the dry products sucked by the plurality of suction nozzles 6 .

FIG. 3 is an enlarged side view showing the vicinity of the suction nozzle 6 of the product recovery device 5 in the drum dryer of the present embodiment, FIGS. 4 to 6 are views showing the suction nozzle 6, and FIG. It is a diagram.

As shown in FIGS. 1 to 6, the suction nozzle 6 is formed in a hollow shape, and the hollow portion is configured as a flow path through which the dried product P (see FIG. 3) flows. The upper end (one end) of the suction nozzle 6 is configured as a suction side end, and the lower end (the other end) is configured as an outflow side end.

Further, the suction nozzle 6 has a wide upper end (dimension in the axial direction of the drum 2) and a narrow lower end. It is formed in a triangular shape. As a result, the suction nozzle 6 is configured such that the cross-sectional area of the flow path through which the dried product P circulates (flow path cross-sectional area) gradually decreases from the upper end (suction side end) toward the lower end (outflow side end). is formed in

A suction port 62 that opens substantially forward is formed at the suction side end of the suction nozzle 6 so as to extend continuously in the width direction (drum axis direction). Both ends in the width direction of the suction port 62 are open outward in the width direction (drum axial direction).

As shown in FIGS. 4 and 5, in the present embodiment, the suction nozzle 6 has a nozzle cover 66 forming a rear wall portion and the remaining wall portions (front wall portion and both side wall portions) of the outer peripheral wall portion. A nozzle cover 66 is detachably attached to the nozzle body 61 by a well-known fastener 69 such as a so-called snap fitting.

The nozzle cover 66 is composed of an opening/closing lid 68 connected via a hinge 67 at a portion corresponding to the suction side end thereof. 4 and 5, the suction-side end of the suction nozzle 6 can be opened to the rear side, and the opening/closing lid 68 is rotated forward, so that the suction-side end of the suction nozzle 6 is exposed to the rear side as shown by the solid lines in FIGS. It is configured so that it can be closed on one side.

A bolt mounting plate 63 is attached to the suction side end portion of the inner surface of both side walls of the suction nozzle 6 so as to protrude substantially upward. It is screwed so that it can be screwed along the opening direction (opening axial direction). The adjusting bolt 64 aligns the suction nozzle 6 with respect to the scraper 3 by bringing the tip of the shaft portion into contact with the scraper 3 . to the scraper 3 can be changed.

An outflow pipe portion 65 is provided at the lower end (the other end) of the suction nozzle 6 . The outflow pipe portion 65 has an upper end communicating with the inside of the suction nozzle 6 and a lower end opening serving as an outflow port.

A plurality of suction nozzles 6 configured as described above are aligned in the axial direction of the drum 2 with their width directions aligned with the axial direction of the drum 2, and each suction port 62 faces the cutting edge 30 of the scraper 3. placed in In this case, since the plurality of suction nozzles 6 are arranged with little space between the adjacent suction nozzles 6, the suction ports 62 of the plurality of suction nozzles 6 are located at both ends of the cutting edge 30 of the scraper 3. It is arranged so that it faces almost the entire area.

On the other hand, the carry-out pipe 7 of the product recovery device 5 is arranged along the axial direction of the drum 2 outside the housing 1 .

One end (upper end) of a relay pipe 75 is connected to each of the outflow pipe portions 65 of the plurality of suction nozzles 6, and each relay pipe 75 penetrates the side wall of the housing 1 to reach the other end (each end). lower end) is connected to the carry-out pipe 7 .

One end (upstream end) of the carry-out pipe 7 is closed, and a suction means 8 is provided at the other end (downstream side). The suction means 8 includes a suction pump or the like, and is configured such that the suction action of the suction means 8 sets the insides of the carry-out pipe 7, each relay pipe 75 and each suction nozzle 6 to a negative pressure. . Further, by setting the negative pressure, the suction port 62 of the suction nozzle 6 is configured to have a suction force for sucking outside air into the suction nozzle 6 .

The carry-out pipe 7 is formed so that the diameter of the pipe gradually increases from the upstream side to the downstream side. That is, the diameter of the upstream end of the carry-out pipe 7 farthest from the suction means 8 is made small, and the pipe diameter of the carry-out pipe 7 increases stepwise as the suction means 8 is approached. As will be described in detail later, this configuration is such that each suction nozzle 6 can be uniformly applied with a suction force.

When manufacturing the dried product P in the drum dryer of the present embodiment having the above configuration, the pair of drums 2, 2 are heated and driven to rotate in the direction of the arrow, while the suction means 8 of the product recovery device 5 is driven. Then, the insides of the carry-out pipe 7, the relay pipe 75 and the suction nozzle 6 are set to a negative pressure, and the suction port 62 of the suction nozzle 6 is caused to generate a suction force.

In this state, the liquid raw material M is supplied from the raw material supply unit 21 between the pair of drums 2 , 2 . The liquid raw material M supplied to and adhered to the outer peripheral surfaces of the drums 2, 2 is heated while moving along the outer peripheral surfaces as the drums 2 are rotated, so that moisture evaporates and dries. Become a product. The dried product thus produced is scraped off the outer peripheral surface of the drum 2 by the scraper 3 and peeled off. Here, in the drum dryer of the present embodiment, since the suction port 62 of the suction nozzle 6 to which the suction force is applied is arranged so as to face the cutting edge 30 of the scraper 3, the dry air scraped from the outer peripheral surface of the drum 2 is dried. The product is sucked into the suction nozzle 6 from the suction port 62 by the suction action. As shown in FIGS. 3 and 7, the dried product P sucked into the suction nozzle 6 is sucked and collected in the carry-out pipe 7 through the outflow pipe portion 65 and the relay pipe 75 of the suction nozzle 6, and further the dried product P are sucked and recovered to a predetermined product recovery section (not shown) through the carry-out pipe 7 .

As described above, according to the drum dryer of the present embodiment, a so-called pneumatic conveying method is adopted in which the dried product P scraped off by the scraper 3 is sucked by the suction nozzle 6 and recovered. Most of the dried products P can be collected, and the dried products P can be prevented from floating and scattering inside the housing 1.例文帳に追加Therefore, it is possible to prevent the dry product P from remaining adhered to the inside of the housing 1, prevent the generation of germs due to the adhered residue, and reduce the labor required for cleaning work and maintenance work, thereby simplifying these works. can be done.

Furthermore, since the dried product P does not scatter inside the housing 1, the dried product P is not unnecessarily discharged together with the steam from the exhaust duct 15 for discharging steam, and the product loss is reduced. can be recovered.

Furthermore, since the dried product P does not scatter inside the housing 1, the dried product P is not exposed to the steam inside the housing 1, and the dryness of the dried product P is reduced due to re-absorption of moisture, that is, the quality of the dried product P. can be prevented from decreasing, and a high-quality dried product P can be reliably manufactured.

Further, in this embodiment, the suction nozzle 6 is formed in a triangular shape as a whole by forming a wide end portion on the suction port 62 side and forming a narrow end portion on the outflow side. Therefore, the cross-sectional area of the flow passage from the suction side to the outflow side of the suction nozzle 6 gradually decreases. Therefore, the suction force and the suction speed (flow speed) gradually increase from the suction side of the suction nozzle 6 toward the outflow side, so that the dried product P sucked from the suction port 62 of the suction nozzle 6 does not stagnate in the middle and is smooth. is sent out to the carry-out pipe 7 at the same time. Therefore, the dried product P can be efficiently sucked from the suction nozzle 6 in a stable state.

Further, in this embodiment, a plurality of suction nozzles 6 arranged in parallel are connected to the carry-out pipe 7 via relay pipes 75 at equal intervals in the longitudinal direction thereof, and the pipe diameter of the carry-out pipe 7 is downstream. Since it is formed so as to increase stepwise toward the side (suction side), each suction nozzle 6 is evenly distributed by the suction action of a suction means 8 such as a suction pump disposed on the downstream side of the carry-out pipe 7 . Suction power can be imparted. Therefore, the suction force of each suction nozzle 6 becomes substantially constant, and the dried product P can be sucked uniformly from the series of suction nozzles 6, and the dried product P can be collected more efficiently.

Furthermore, in the present embodiment, the dry product P sucked from the suction port 62 passes through a closed channel formed by the suction nozzle 6, the relay pipe 75 and the carry-out pipe 7 and is collected by the product recovery section. No exposure to steam in 1. Therefore, it is possible to more reliably prevent the dryness (quality) of the dried product P from deteriorating due to re-absorption of moisture from the steam, and to produce the dried product P of even higher quality.

Further, in this embodiment, an opening/closing lid 68 is provided on the back side of the suction nozzle 6 so as to correspond to the suction port 62, so that the cutting edge 30 of the scraper 3 is exposed by opening the opening/closing lid 68. In this state, the cylinder 44 of the scraper support mechanism 4 is driven to separate the scraper 3 from the outer peripheral surface of the drum, so that the scraper 3 can be easily adjusted in position and attached/detached. Maintenance work can be performed without hindrance.

In the above embodiment, a steam-heated drum dryer that heats the drum 2 with heated steam has been described as an example, but the present invention is not limited to this, and the drum heating method is not particularly limited. do not have. For example, in the present invention, an electric heater or hot water may be used to heat the drum, or induction heating (IH) may be used to heat the drum.

In the above embodiment, the case where the present invention is applied to a double-drum type drum dryer has been described as an example. can be similarly applied to

INDUSTRIAL APPLICABILITY The drum dryer of the present invention can be suitably used for producing dry products such as chemical products, chemicals, foodstuffs, and dye products by drying and solidifying liquid raw materials.

2: Drum 3: Scraper 30: Cutting edge 6: Suction nozzle 62: Suction port 65: Outflow pipe (outflow port)
68: Open/close lid 7: Carry-out pipe 8: Suction means M: Liquid raw material P: Dry product

Claims (4)

Equipped with a drum that rotates in a heated state and a scraper with a cutting edge facing the outer peripheral surface of the drum, the liquid raw material supplied to the outer peripheral surface of the drum is heated and dried, and the dried product is the above-mentioned. A drum dryer adapted to be scraped by a blade edge of a scraper,
a suction nozzle provided with a suction port at one end and an outflow port at the other end, and arranged in such a manner that the suction port faces the cutting edge of the scraper;
a discharge pipe to which the outflow port of the suction nozzle is connected;
By setting the inside of the carry-out pipe and the suction nozzle to a negative pressure, the dried product scraped by the scraper is sucked into the suction nozzle through the suction port, and the predetermined product is supplied through the carry-out pipe. A drum dryer comprising suction means for suction and recovery in a recovery section. 2. The drum dryer according to claim 1, wherein said suction nozzle is formed so that the internal flow passage cross-sectional area thereof gradually decreases from one end to the other end. The suction nozzle has an openable/closable lid corresponding to the suction port,
3. The drum dryer according to claim 1, wherein the cutting edge of the scraper is exposed to the outside when the opening/closing cover is opened. A plurality of the suction nozzles are installed in parallel along the axial direction of the drum,
The carry-out pipe is arranged such that the length direction as the carrying direction is along the direction in which the plurality of suction nozzles are arranged side by side, and the outlets of the plurality of suction nozzles are spaced apart in the length direction of the carry-out pipe. are sequentially concatenated in
4. The drum dryer according to any one of claims 1 to 3, wherein the carry-out pipe is formed such that the pipe diameter increases stepwise or continuously from the upstream side to the downstream side in the carry-out direction.

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